fix(ci): serialize tests sharing Vite optimizer cache

[james-elicx]

Summary

• move five Vite dev-server/build fixture files from the parallel unit project to the serial integration project
• prevent concurrent fixtures from invalidating each other through the physically shared node_modules/.vite optimizer cache
• cover the rotating failures seen in main run 31431720057 and main run 31436702312

Root cause

createIsolatedFixture() gives each temporary project a symlink to the workspace node_modules. Vite therefore resolves each nominal <fixture>/node_modules/.vite directory to the same physical optimizer cache. When these files run in parallel workers, one server can re-optimize that cache while another request is loading it. The captured 500 body was Vite throwOutdatedRequest: “There is a new version of the pre-bundle”.

The five moved files all have this exact topology:

• sass-tsconfig-paths.test.ts
• hybrid-i18n-api-handoff.test.ts
• middleware-matcher-auth.test.ts
• tsconfig-path-alias-resolution.test.ts
• optimize-deps-jsx-in-js.test.ts

Validation

• unit collection: 0 tests from these files
• integration collection: 43 tests
• focused integration run: 43/43 passed
• integration shard manifest check: 78 files, clean
• planned integration shard 10/10: 126/126 passed with no outdated-prebundle errors
• vp check vite.config.ts: passed
• exact CI=1 vp test run --project unit --shard=1/3: no HTTP 500 or outdated-prebundle error; one unrelated local performance-trace 5-second timeout remained under concurrent machine load

Two independent reviews reported no actionable findings before this PR was opened.

[james-elicx]

/bigbonk review for issues

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commit: b0d4ace

[github-actions]

Example	Preview	Production	Original
app-router-cloudflare	preview	production
pages-router-cloudflare	preview	production
app-router-playground	preview	production	original
realworld-api-rest	preview	production
nextra-docs-template	preview	production
benchmarks	preview	production
hackernews	preview	production	original
workers-cache	preview	production
web	preview	production

[github-actions]

Performance benchmarks

Compared b0d4ace against base 8c1804d using alternating same-runner rounds. Next.js was unchanged and skipped.

0 improved · 0 regressed · 6 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	135.2 KB	135.2 KB	⚫ +0.0%
Client entry size (gzip)	vinext	122.7 KB	122.7 KB	⚫ +0.0%
Dev server cold start	vinext	2.96 s	2.93 s	⚫ -0.9%
Production build time	vinext	3.05 s	3.07 s	⚫ +0.6%
RSC entry closure size (gzip)	vinext	114.2 KB	114.2 KB	⚫ -0.0%
Server bundle size (gzip)	vinext	193.0 KB	193.0 KB	⚫ -0.0%

View detailed results and traces

_{🟢 improvement · 🔴 regression · ⚫ change below 1.5% · paired base/head}

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